<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>添加圆角</title>
	<style type="text/css">
        div{
        	border:2px solid #ccc;width:500px;height: 50px;text-align: center;line-height: 50px;border-radius: 20px;background: #eee;
        }
	</style>
</head>
<body>
   
    <div>border-radius属性允许您向元素添加圆角</div>
	
</body>
</html>